package cn.hdu.liang.holding;

import java.util.ArrayList;

class GrannySmith extends Apple {

}

class Gala extends Apple {

}

class Fuji extends Apple {

}

class Braeburn extends Apple {

}


public class GenericsAndUpcasting {
    public static void main(String[] args) {
        ArrayList<Apple> apples = new ArrayList<>();
        apples.add(new GrannySmith());
        apples.add(new Gala());
        apples.add(new Fuji());
        apples.add(new Braeburn());
        for(Apple c : apples) {
            System.out.println(c);
        }
    }
}
